Finding the Fourth Proportional to 3,982.60, 5,495.50 and 2,189.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,982.60 : 5,495.50 = 2,189.78 : x
2. Step 2: Convert to fraction form
   3,982.60/5,495.50 = 2,189.78/x
3. Step 3: Cross multiply
   3,982.60x = 5,495.50 × 2,189.78
4. Step 4: Simplify right side
   3,982.60x = 12,033,897.56
5. Step 5: Solve for x
   x = 12,033,897.56/3,982.60
6. Step 6: Final answer
   x = 3,021.62